Add HomeKit camera pairing support

- Add POST /api/homekit/pair endpoint that calls hap.Pair() from go2rtc
- Rewrite homekit.html with PIN input UI (XXX-XX-XXX format)
- Auto-advance between digit fields, paste support, error/success states
- On successful pairing, redirect to create.html with homekit:// URL
- Pass mdns_port and mdns_paired from probe to homekit.html
- Detect HomeKit cameras regardless of pairing status

internal/probe/probe.go

@@ -35,7 +35,7 @@ func Init() {
 	ports = loadPorts()
 	// HomeKit detector
 	detectors = append(detectors, func(r *probe.Response) string {
-		if r.Probes.MDNS != nil && !r.Probes.MDNS.Paired {
+		if r.Probes.MDNS != nil {
 			if r.Probes.MDNS.Category == "camera" || r.Probes.MDNS.Category == "doorbell" {
 				return "homekit"
 			}